Microsoft discontinued Windows Live Messenger (previously known as MSN Messenger) in April 2013. The product is now only supported in mainland China, so outside of China, it is unlikely to find someone who still uses Messenger.
Microsoft now suggests users adopt Skype, which has the same instant text messaging functions as Messenger did, as well as video and audio chat. If a user attempts to log into the Messenger client, they will be directed to download Skype.
MSN Messenger (renamed Windows Live Messenger in 2005) was one of the most popular instant messaging programs of the 2000s, boasting 330 million users monthly in 2009.